Whitelisting in Mimecast

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3 comments

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    Jonathan Gillespie

    Mimecast's current systems want's the IP address's in CIDR notation, using Whois lookup's, I used the following:

    23.21.109.197/14
    23.21.109.212/14
    192.254.121.248/20

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    Katie Brennan

    Hi Johnathon, we would recommend using the CIDR notation of /32 instead of /14 or /20.

    Hope this helps!
    Katie

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    Computer Support

    I believe the screenshot above should say "Permit Sender" rather than "Take No Action" under Options - Select Option

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